Android之Home鍵監聽封裝

眾所周知，我們監聽返回鍵事件，無法是下面兩個方法：

    @Override

        public void onBackPressed() {

            //do something

            //super.onBackPressed();

        }


    @Override  
    public boolean onKeyDown(int keyCode, KeyEvent event) {  
        if(keyCode == KeyEvent.KEYCODE_BACK){  
            //do something  
        }  
        return super.onKeyDown(keyCode, event);  
    }  </pre></span> <p><span style="font-family:Comic Sans MS;font-size:14px;">于是乎，我們理所當然的想到，監聽Home鍵的方法是：if(keyCode == KeyEvent.KEYCODE_HOME)。但實際上，這樣是行不通的，因為此時home鍵的消息在framework層就已經被攔截，所以，我們在應用中通過此方法是無法監聽到Home鍵的消息的。那么我們如何捕獲Home鍵事件，并作出相應處理呢？其實系統還是給我們發出廣播的，下面，就跟大家分享一下，封裝好了的監聽Home鍵的方法：</span></p>

HomeWatcher類：
    /**


 * Home鍵監聽封裝 
 *  
 * @author way 
 *  
 */  
public class HomeWatcher {  

    static final String TAG = "HomeWatcher";  
    private Context mContext;  
    private IntentFilter mFilter;  
    private OnHomePressedListener mListener;  
    private InnerRecevier mRecevier;  

    // 回調接口  
    public interface OnHomePressedListener {  
        public void onHomePressed();  

        public void onHomeLongPressed();  
    }  

    public HomeWatcher(Context context) {  
        mContext = context;  
        mFilter = new IntentFilter(Intent.ACTION_CLOSE_SYSTEM_DIALOGS);  
    }  

    /** 
     * 設置監聽 
     *  
     * @param listener 
     */  
    public void setOnHomePressedListener(OnHomePressedListener listener) {  
        mListener = listener;  
        mRecevier = new InnerRecevier();  
    }  

    /** 
     * 開始監聽，注冊廣播 
     */  
    public void startWatch() {  
        if (mRecevier != null) {  
            mContext.registerReceiver(mRecevier, mFilter);  
        }  
    }  

    /** 
     * 停止監聽，注銷廣播 
     */  
    public void stopWatch() {  
        if (mRecevier != null) {  
            mContext.unregisterReceiver(mRecevier);  
        }  
    }  

    /** 
     * 廣播接收者 
     */  
    class InnerRecevier extends BroadcastReceiver {  
        final String SYSTEM_DIALOG_REASON_KEY = "reason";  
        final String SYSTEM_DIALOG_REASON_GLOBAL_ACTIONS = "globalactions";  
        final String SYSTEM_DIALOG_REASON_RECENT_APPS = "recentapps";  
        final String SYSTEM_DIALOG_REASON_HOME_KEY = "homekey";  

        @Override  
        public void onReceive(Context context, Intent intent) {  
            String action = intent.getAction();  
            if (action.equals(Intent.ACTION_CLOSE_SYSTEM_DIALOGS)) {  
                String reason = intent.getStringExtra(SYSTEM_DIALOG_REASON_KEY);  
                if (reason != null) {  
                    Log.e(TAG, "action:" + action + ",reason:" + reason);  
                    if (mListener != null) {  
                        if (reason.equals(SYSTEM_DIALOG_REASON_HOME_KEY)) {  
                            // 短按home鍵  
                            mListener.onHomePressed();  
                        } else if (reason  
                                .equals(SYSTEM_DIALOG_REASON_RECENT_APPS)) {  
                            // 長按home鍵  
                            mListener.onHomeLongPressed();  
                        }  
                    }  
                }  
            }  
        }  
    }  
}  </pre></span><span style="font-family:Comic Sans MS;font-size:14px;">接下來，我們需要在應用中開啟監聽，下面是以在Activity中的應用為例：<pre class="brush:java; toolbar: true; auto-links: false;">    /** 
 * 應用HomeWatcher小例 
 *  
 * @author way 
 *  
 */  
public class MainActivity extends Activity {  
    private static final String TAG = "MainActivity";  
    private HomeWatcher mHomeWatcher;  

    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  

        mHomeWatcher = new HomeWatcher(this);  
        mHomeWatcher.setOnHomePressedListener(new OnHomePressedListener() {  
            @Override  
            public void onHomePressed() {  
                Log.e(TAG, "onHomePressed");  
            }  

            @Override  
            public void onHomeLongPressed() {  
                Log.e(TAG, "onHomeLongPressed");  
            }  
        });  
        mHomeWatcher.startWatch();  
    }  

    @Override  
    protected void onPause() {  
        super.onPause();  
        mHomeWatcher.stopWatch();// 在onPause中停止監聽，不然會報錯的。  
    }  
}  </pre>來自：<a href="/misc/goto?guid=4959545811011490375">http://blog.csdn.net/weidi1989/article/details/8953622</a></span>